1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "ui/views/bubble/bubble_border.h"
6
7 #include <algorithm>
8
9 #include "base/logging.h"
10 #include "ui/base/resource/resource_bundle.h"
11 #include "ui/gfx/canvas.h"
12 #include "ui/gfx/rect.h"
13 #include "ui/gfx/skia_util.h"
14 #include "ui/resources/grit/ui_resources.h"
15 #include "ui/views/painter.h"
16 #include "ui/views/view.h"
17
18 namespace views {
19
20 namespace internal {
21
BorderImages(const int border_image_ids[],const int arrow_image_ids[],int border_interior_thickness,int arrow_interior_thickness,int corner_radius)22 BorderImages::BorderImages(const int border_image_ids[],
23 const int arrow_image_ids[],
24 int border_interior_thickness,
25 int arrow_interior_thickness,
26 int corner_radius)
27 : border_painter(Painter::CreateImageGridPainter(border_image_ids)),
28 border_thickness(0),
29 border_interior_thickness(border_interior_thickness),
30 arrow_thickness(0),
31 arrow_interior_thickness(arrow_interior_thickness),
32 corner_radius(corner_radius) {
33 ResourceBundle& rb = ResourceBundle::GetSharedInstance();
34 border_thickness = rb.GetImageSkiaNamed(border_image_ids[0])->width();
35 if (arrow_image_ids[0] != 0) {
36 left_arrow = *rb.GetImageSkiaNamed(arrow_image_ids[0]);
37 top_arrow = *rb.GetImageSkiaNamed(arrow_image_ids[1]);
38 right_arrow = *rb.GetImageSkiaNamed(arrow_image_ids[2]);
39 bottom_arrow = *rb.GetImageSkiaNamed(arrow_image_ids[3]);
40 arrow_thickness = top_arrow.height();
41 }
42 }
43
~BorderImages()44 BorderImages::~BorderImages() {}
45
46 } // namespace internal
47
48 namespace {
49
50 // Bubble border and arrow image resource ids. They don't use the IMAGE_GRID
51 // macro because there is no center image.
52 const int kNoShadowImages[] = {
53 IDR_BUBBLE_TL, IDR_BUBBLE_T, IDR_BUBBLE_TR,
54 IDR_BUBBLE_L, 0, IDR_BUBBLE_R,
55 IDR_BUBBLE_BL, IDR_BUBBLE_B, IDR_BUBBLE_BR };
56 const int kNoShadowArrows[] = {
57 IDR_BUBBLE_L_ARROW, IDR_BUBBLE_T_ARROW,
58 IDR_BUBBLE_R_ARROW, IDR_BUBBLE_B_ARROW, };
59
60 const int kBigShadowImages[] = {
61 IDR_WINDOW_BUBBLE_SHADOW_BIG_TOP_LEFT,
62 IDR_WINDOW_BUBBLE_SHADOW_BIG_TOP,
63 IDR_WINDOW_BUBBLE_SHADOW_BIG_TOP_RIGHT,
64 IDR_WINDOW_BUBBLE_SHADOW_BIG_LEFT,
65 0,
66 IDR_WINDOW_BUBBLE_SHADOW_BIG_RIGHT,
67 IDR_WINDOW_BUBBLE_SHADOW_BIG_BOTTOM_LEFT,
68 IDR_WINDOW_BUBBLE_SHADOW_BIG_BOTTOM,
69 IDR_WINDOW_BUBBLE_SHADOW_BIG_BOTTOM_RIGHT };
70 const int kBigShadowArrows[] = {
71 IDR_WINDOW_BUBBLE_SHADOW_SPIKE_BIG_LEFT,
72 IDR_WINDOW_BUBBLE_SHADOW_SPIKE_BIG_TOP,
73 IDR_WINDOW_BUBBLE_SHADOW_SPIKE_BIG_RIGHT,
74 IDR_WINDOW_BUBBLE_SHADOW_SPIKE_BIG_BOTTOM };
75
76 const int kSmallShadowImages[] = {
77 IDR_WINDOW_BUBBLE_SHADOW_SMALL_TOP_LEFT,
78 IDR_WINDOW_BUBBLE_SHADOW_SMALL_TOP,
79 IDR_WINDOW_BUBBLE_SHADOW_SMALL_TOP_RIGHT,
80 IDR_WINDOW_BUBBLE_SHADOW_SMALL_LEFT,
81 0,
82 IDR_WINDOW_BUBBLE_SHADOW_SMALL_RIGHT,
83 IDR_WINDOW_BUBBLE_SHADOW_SMALL_BOTTOM_LEFT,
84 IDR_WINDOW_BUBBLE_SHADOW_SMALL_BOTTOM,
85 IDR_WINDOW_BUBBLE_SHADOW_SMALL_BOTTOM_RIGHT };
86 const int kSmallShadowArrows[] = {
87 IDR_WINDOW_BUBBLE_SHADOW_SPIKE_SMALL_LEFT,
88 IDR_WINDOW_BUBBLE_SHADOW_SPIKE_SMALL_TOP,
89 IDR_WINDOW_BUBBLE_SHADOW_SPIKE_SMALL_RIGHT,
90 IDR_WINDOW_BUBBLE_SHADOW_SPIKE_SMALL_BOTTOM };
91
92 using internal::BorderImages;
93
94 // Returns the cached BorderImages for the given |shadow| type.
GetBorderImages(BubbleBorder::Shadow shadow)95 BorderImages* GetBorderImages(BubbleBorder::Shadow shadow) {
96 // Keep a cache of bubble border image-set painters, arrows, and metrics.
97 static BorderImages* kBorderImages[BubbleBorder::SHADOW_COUNT] = { NULL };
98
99 CHECK_LT(shadow, BubbleBorder::SHADOW_COUNT);
100 struct BorderImages*& set = kBorderImages[shadow];
101 if (set)
102 return set;
103
104 switch (shadow) {
105 case BubbleBorder::NO_SHADOW:
106 case BubbleBorder::NO_SHADOW_OPAQUE_BORDER:
107 set = new BorderImages(kNoShadowImages, kNoShadowArrows, 6, 7, 4);
108 break;
109 case BubbleBorder::BIG_SHADOW:
110 set = new BorderImages(kBigShadowImages, kBigShadowArrows, 23, 9, 2);
111 break;
112 case BubbleBorder::SMALL_SHADOW:
113 set = new BorderImages(kSmallShadowImages, kSmallShadowArrows, 5, 6, 2);
114 break;
115 case BubbleBorder::SHADOW_COUNT:
116 NOTREACHED();
117 break;
118 }
119
120 return set;
121 }
122
123 } // namespace
124
125 const int BubbleBorder::kStroke = 1;
126
BubbleBorder(Arrow arrow,Shadow shadow,SkColor color)127 BubbleBorder::BubbleBorder(Arrow arrow, Shadow shadow, SkColor color)
128 : arrow_(arrow),
129 arrow_offset_(0),
130 arrow_paint_type_(PAINT_NORMAL),
131 alignment_(ALIGN_ARROW_TO_MID_ANCHOR),
132 shadow_(shadow),
133 background_color_(color),
134 use_theme_background_color_(false) {
135 DCHECK(shadow < SHADOW_COUNT);
136 images_ = GetBorderImages(shadow);
137 }
138
~BubbleBorder()139 BubbleBorder::~BubbleBorder() {}
140
GetBounds(const gfx::Rect & anchor_rect,const gfx::Size & contents_size) const141 gfx::Rect BubbleBorder::GetBounds(const gfx::Rect& anchor_rect,
142 const gfx::Size& contents_size) const {
143 int x = anchor_rect.x();
144 int y = anchor_rect.y();
145 int w = anchor_rect.width();
146 int h = anchor_rect.height();
147 const gfx::Size size(GetSizeForContentsSize(contents_size));
148 const int arrow_offset = GetArrowOffset(size);
149 const int arrow_size =
150 images_->arrow_interior_thickness + kStroke - images_->arrow_thickness;
151 const bool mid_anchor = alignment_ == ALIGN_ARROW_TO_MID_ANCHOR;
152
153 // Calculate the bubble coordinates based on the border and arrow settings.
154 if (is_arrow_on_horizontal(arrow_)) {
155 if (is_arrow_on_left(arrow_)) {
156 x += mid_anchor ? w / 2 - arrow_offset : kStroke - GetBorderThickness();
157 } else if (is_arrow_at_center(arrow_)) {
158 x += w / 2 - arrow_offset;
159 } else {
160 x += mid_anchor ? w / 2 + arrow_offset - size.width() :
161 w - size.width() + GetBorderThickness() - kStroke;
162 }
163 y += is_arrow_on_top(arrow_) ? h + arrow_size : -arrow_size - size.height();
164 } else if (has_arrow(arrow_)) {
165 x += is_arrow_on_left(arrow_) ? w + arrow_size : -arrow_size - size.width();
166 if (is_arrow_on_top(arrow_)) {
167 y += mid_anchor ? h / 2 - arrow_offset : kStroke - GetBorderThickness();
168 } else if (is_arrow_at_center(arrow_)) {
169 y += h / 2 - arrow_offset;
170 } else {
171 y += mid_anchor ? h / 2 + arrow_offset - size.height() :
172 h - size.height() + GetBorderThickness() - kStroke;
173 }
174 } else {
175 x += (w - size.width()) / 2;
176 y += (arrow_ == NONE) ? h : (h - size.height()) / 2;
177 }
178
179 return gfx::Rect(x, y, size.width(), size.height());
180 }
181
GetBorderThickness() const182 int BubbleBorder::GetBorderThickness() const {
183 return images_->border_thickness - images_->border_interior_thickness;
184 }
185
GetBorderCornerRadius() const186 int BubbleBorder::GetBorderCornerRadius() const {
187 return images_->corner_radius;
188 }
189
GetArrowOffset(const gfx::Size & border_size) const190 int BubbleBorder::GetArrowOffset(const gfx::Size& border_size) const {
191 const int edge_length = is_arrow_on_horizontal(arrow_) ?
192 border_size.width() : border_size.height();
193 if (is_arrow_at_center(arrow_) && arrow_offset_ == 0)
194 return edge_length / 2;
195
196 // Calculate the minimum offset to not overlap arrow and corner images.
197 const int min = images_->border_thickness + (images_->top_arrow.width() / 2);
198 // Ensure the returned value will not cause image overlap, if possible.
199 return std::max(min, std::min(arrow_offset_, edge_length - min));
200 }
201
Paint(const views::View & view,gfx::Canvas * canvas)202 void BubbleBorder::Paint(const views::View& view, gfx::Canvas* canvas) {
203 gfx::Rect bounds(view.GetContentsBounds());
204 bounds.Inset(-GetBorderThickness(), -GetBorderThickness());
205 const gfx::Rect arrow_bounds = GetArrowRect(view.GetLocalBounds());
206 if (arrow_bounds.IsEmpty()) {
207 Painter::PaintPainterAt(canvas, images_->border_painter.get(), bounds);
208 return;
209 }
210
211 // Clip the arrow bounds out to avoid painting the overlapping edge area.
212 canvas->Save();
213 SkRect arrow_rect(gfx::RectToSkRect(arrow_bounds));
214 canvas->sk_canvas()->clipRect(arrow_rect, SkRegion::kDifference_Op);
215 Painter::PaintPainterAt(canvas, images_->border_painter.get(), bounds);
216 canvas->Restore();
217
218 DrawArrow(canvas, arrow_bounds);
219 }
220
GetInsets() const221 gfx::Insets BubbleBorder::GetInsets() const {
222 // The insets contain the stroke and shadow pixels outside the bubble fill.
223 const int inset = GetBorderThickness();
224 if ((arrow_paint_type_ == PAINT_NONE) || !has_arrow(arrow_))
225 return gfx::Insets(inset, inset, inset, inset);
226
227 int first_inset = inset;
228 int second_inset = std::max(inset, images_->arrow_thickness);
229 if (is_arrow_on_horizontal(arrow_) ?
230 is_arrow_on_top(arrow_) : is_arrow_on_left(arrow_))
231 std::swap(first_inset, second_inset);
232 return is_arrow_on_horizontal(arrow_) ?
233 gfx::Insets(first_inset, inset, second_inset, inset) :
234 gfx::Insets(inset, first_inset, inset, second_inset);
235 }
236
GetMinimumSize() const237 gfx::Size BubbleBorder::GetMinimumSize() const {
238 return GetSizeForContentsSize(gfx::Size());
239 }
240
GetSizeForContentsSize(const gfx::Size & contents_size) const241 gfx::Size BubbleBorder::GetSizeForContentsSize(
242 const gfx::Size& contents_size) const {
243 // Enlarge the contents size by the thickness of the border images.
244 gfx::Size size(contents_size);
245 const gfx::Insets insets = GetInsets();
246 size.Enlarge(insets.width(), insets.height());
247
248 // Ensure the bubble is large enough to not overlap border and arrow images.
249 const int min = 2 * images_->border_thickness;
250 const int min_with_arrow_width = min + images_->top_arrow.width();
251 const int min_with_arrow_thickness = images_->border_thickness +
252 std::max(images_->arrow_thickness + images_->border_interior_thickness,
253 images_->border_thickness);
254 // Only take arrow image sizes into account when the bubble tip is shown.
255 if (arrow_paint_type_ == PAINT_NONE || !has_arrow(arrow_))
256 size.SetToMax(gfx::Size(min, min));
257 else if (is_arrow_on_horizontal(arrow_))
258 size.SetToMax(gfx::Size(min_with_arrow_width, min_with_arrow_thickness));
259 else
260 size.SetToMax(gfx::Size(min_with_arrow_thickness, min_with_arrow_width));
261 return size;
262 }
263
GetArrowImage() const264 gfx::ImageSkia* BubbleBorder::GetArrowImage() const {
265 if (!has_arrow(arrow_))
266 return NULL;
267 if (is_arrow_on_horizontal(arrow_)) {
268 return is_arrow_on_top(arrow_) ?
269 &images_->top_arrow : &images_->bottom_arrow;
270 }
271 return is_arrow_on_left(arrow_) ?
272 &images_->left_arrow : &images_->right_arrow;
273 }
274
GetArrowRect(const gfx::Rect & bounds) const275 gfx::Rect BubbleBorder::GetArrowRect(const gfx::Rect& bounds) const {
276 if (!has_arrow(arrow_) || arrow_paint_type_ != PAINT_NORMAL)
277 return gfx::Rect();
278
279 gfx::Point origin;
280 int offset = GetArrowOffset(bounds.size());
281 const int half_length = images_->top_arrow.width() / 2;
282 const gfx::Insets insets = GetInsets();
283
284 if (is_arrow_on_horizontal(arrow_)) {
285 origin.set_x(is_arrow_on_left(arrow_) || is_arrow_at_center(arrow_) ?
286 offset : bounds.width() - offset);
287 origin.Offset(-half_length, 0);
288 if (is_arrow_on_top(arrow_))
289 origin.set_y(insets.top() - images_->arrow_thickness);
290 else
291 origin.set_y(bounds.height() - insets.bottom());
292 } else {
293 origin.set_y(is_arrow_on_top(arrow_) || is_arrow_at_center(arrow_) ?
294 offset : bounds.height() - offset);
295 origin.Offset(0, -half_length);
296 if (is_arrow_on_left(arrow_))
297 origin.set_x(insets.left() - images_->arrow_thickness);
298 else
299 origin.set_x(bounds.width() - insets.right());
300 }
301 return gfx::Rect(origin, GetArrowImage()->size());
302 }
303
DrawArrow(gfx::Canvas * canvas,const gfx::Rect & arrow_bounds) const304 void BubbleBorder::DrawArrow(gfx::Canvas* canvas,
305 const gfx::Rect& arrow_bounds) const {
306 canvas->DrawImageInt(*GetArrowImage(), arrow_bounds.x(), arrow_bounds.y());
307 const bool horizontal = is_arrow_on_horizontal(arrow_);
308 const int thickness = images_->arrow_interior_thickness;
309 float tip_x = horizontal ? arrow_bounds.CenterPoint().x() :
310 is_arrow_on_left(arrow_) ? arrow_bounds.right() - thickness :
311 arrow_bounds.x() + thickness;
312 float tip_y = !horizontal ? arrow_bounds.CenterPoint().y() + 0.5f :
313 is_arrow_on_top(arrow_) ? arrow_bounds.bottom() - thickness :
314 arrow_bounds.y() + thickness;
315 const bool positive_offset = horizontal ?
316 is_arrow_on_top(arrow_) : is_arrow_on_left(arrow_);
317 const int offset_to_next_vertex = positive_offset ?
318 images_->arrow_interior_thickness : -images_->arrow_interior_thickness;
319
320 SkPath path;
321 path.incReserve(4);
322 path.moveTo(SkDoubleToScalar(tip_x), SkDoubleToScalar(tip_y));
323 path.lineTo(SkDoubleToScalar(tip_x + offset_to_next_vertex),
324 SkDoubleToScalar(tip_y + offset_to_next_vertex));
325 const int multiplier = horizontal ? 1 : -1;
326 path.lineTo(SkDoubleToScalar(tip_x - multiplier * offset_to_next_vertex),
327 SkDoubleToScalar(tip_y + multiplier * offset_to_next_vertex));
328 path.close();
329
330 SkPaint paint;
331 paint.setStyle(SkPaint::kFill_Style);
332 paint.setColor(background_color_);
333
334 canvas->DrawPath(path, paint);
335 }
336
GetImagesForTest() const337 internal::BorderImages* BubbleBorder::GetImagesForTest() const {
338 return images_;
339 }
340
Paint(gfx::Canvas * canvas,views::View * view) const341 void BubbleBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
342 if (border_->shadow() == BubbleBorder::NO_SHADOW_OPAQUE_BORDER)
343 canvas->DrawColor(border_->background_color());
344
345 // Fill the contents with a round-rect region to match the border images.
346 SkPaint paint;
347 paint.setAntiAlias(true);
348 paint.setStyle(SkPaint::kFill_Style);
349 paint.setColor(border_->background_color());
350 SkPath path;
351 gfx::Rect bounds(view->GetLocalBounds());
352 bounds.Inset(border_->GetInsets());
353
354 canvas->DrawRoundRect(bounds, border_->GetBorderCornerRadius(), paint);
355 }
356
357 } // namespace views
358